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    Excess volumetric properties of mixtures (epichlorohydrine plus toluene and epichlorohydrine plus xylene) at 298.15, 308.15, 323.15, and 338.15 K1
    (Interperiodica, 2004) Vural, US; Muradoglu, V; Yuruk, H
    The densities and excess molar volumes of (epichlorohydrine + toluene and xylene) mixtures were determined at different temperatures. The graphs of excess molar volumes against mole fraction of mixtures show a negative and positive slope because of charge-transfer interaction and physical forces at 298.15, 308.15, 323.15, and 338.15 K, respectively.
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    Excess volumetric properties of mixtures epichlorohydrine plus acetone or chloroform at 291.15 and 296.15 K
    (Interperiodica, 2003) Vural, US; Yuruk, H; Muradoglu, V
    The excess molar volumes and densities of mixtures containing epichlorohydrine, acetone, and chloroforrn were determined at different temperatures by the Redlich-Kister equation. Chemical interaction and physical forces are very important influences on the excess molar volume of (epichlorohydrine + acetone or chloroform) mixtures. In addition, the variations of excess molar volumes were expressed as function of temperature.
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    Immobilization of invertase and glucose oxidase in conducting copolymers of thiophene functionalized poly(vinyl alcohol) with pyrrole
    (ELSEVIER SCIENCE BV, 2006) Sahmetlioglu, E; Yuruk, H; Toppare, L; Cianga, I; Yagci, Y
    In this study, immobilizations of invertase and glucose oxidase were achieved in conducting thiophene functionalized copolymers of vinyl alcohol with thiophene side groups and pyrrole (PVATh/PPy) via electrochemical polymerization. The kinetic parameters, V-max (maximum reaction rate) and K-m (substrate affinity), of both free and immobilized enzymes were determined. The effect of supporting electrolytes, p-toluene sulfonic acid and sodium dodecyl sulfate, on the enzyme activity and film morphologies was examined. The optimum temperature, operational and storage stabilities of immobilized enzymes were determined. PVATh/PPy copolymer was found to exhibit significantly enhanced properties compared to pristine polypyrrole. (c) 2005 Elsevier B.V. All rights reserved.
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    Synthesis and characterization of conducting copolymers of poly(vinyl alcohol) with thiophene side-groups and pyrrole
    (WILEY, 2004) Sahmetlioglu, E; Yuruk, H; Toppare, L; Cianga, I; Yagci, Y
    Graft copolymers of poly(vinyl alcohol) with thiophene side-groups and pyrrole were synthesized by electrochemical polymerization methods. Poly(vinyl alcohol) with thiophene side-groups (PVATh) was obtained from the reaction between poly(vinyl alcohol) (PVA) and thiophene-3-acetic acid. The syntheses of copolymers Of PVATh and pyrrole were achieved electrochemically by using three different supporting electrolytes, p-toluene sulfonic acid (PTSA), sodium dodecyl sulfate (SDS) and tetrabutylammonium tetrafluoroborate (TBAFB). Characterization of PVATh and graft copolymers was performed by a combination of techniques including cyclic voltammetry, scanning electron microscopy, thermal gravimetry, differential scanning calorimetry, size-exclusion chromatography, H-1 NMR and FT-IR. The conductivities were measured by the four-probe technique. (C) 2004 Society of Chemical Industry.
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    Synthesis and characterization of oligosalicylaldehyde-based epoxy resins
    (SLOVAK ACADEMIC PRESS LTD, 2006) Sahmetlioglu, E; Mart, H; Yuruk, H; Surme, Y
    The synthesis of a new epoxy resin of oligosalicylaldehyde by the reaction with epichlorohydrin is reported. New resin's epoxy value and chlorine content were determined and found to be 25 % and 1 %, respectively. The characterization of the new resin was instrumented by FTIR, H-1 NMR, scanning electron microscopy, and thermal gravimetric analyses. TGA results showed that the cured epoxy resin has a good resistance to thermal decomposition. The mass losses of cured epoxy resin were found to be 5 %, 10 %, 50 % at 175 degrees C, 240 degrees C and 400 degrees C, respectively. On the curing procedure the resin was cured with polyethylenepolyamine at 25 degrees C for 8 h and 100 degrees C for 1.5 h. The FTIR spectrum of new epoxy resin gave the peak of oxirane ring a (nu) over bar = 918 cm(-1).
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    Synthesis and properties of novel Schiff base oligomers based on oligo-4-hydroxybenzaldehyde
    (JOHN WILEY & SONS INC, 2004) Mart, H; Sacak, M; Yuruk, H; Sahmetlioglu, E; Vilayetoglu, AR
    Condensation of oligo-4-hydroxybenzaldehyde with aniline, 2-chloroaniline, 2-aminophenol, 2-aminotoluene, 4-aminotoluene, and 4-nitroaniline gave the corresponding Schiff base oligomers (OFAP, OKAP, OHAP, OOAP, OTAP, and ONAP, respectively). The products were characterized by H-1 NMR, Fourier transform infrared, ultraviolet-visible, and elemental analyses. The number-average molecular weight, mass-average molecular weight, and polydispersity index (PDI) values of the Schiff base oligomers were determined. Thermogravimetric analysis was used to compare the thermal stability of the oligomers, which showed the Schiff base oligomers to be resistant to thermooxidative decomposition. Weight loss of 5% and 50% occurred at temperatures of 122 and 475 degreesC; for OFAP, at 118 and 453 degreesC; for OKAP, at 182 and 491 degreesC; for OHAP, at 150 and 452 degreesC; for OOAP, at 132 and 401 degreesC; for OTAP, and at 193 and 414 degreesC for ONAP. (C) 2004 Wiley Periodicals, Inc.
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    The synthesis and thermal properties of oligo-3-hydroxybenzaldehyde synthesized by oxidative polycondensation
    (JOHN WILEY & SONS INC, 2006) Mart, H; Sokmen, T; Yuruk, H
    Polymerization of 3-hydroxybenzaldehyde was investigated by oxidative polycondensation (OP) method. No polycondensation reaction was observed both in acidic (in CH3COOH) and organic (in THF) media. Polycondensation was carried out with hydrogenperoxide (H2O2) in an aqueous alkaline medium at 90 degrees C. The product was characterized by H-1 NMR, C-13 NMR, FTIR, UV-vis, and elemental analysis. The number average molecular weight, mass average molecular weight, and polydispersity index values of O-3HBA were found to be 3600, 8000 g mol(-1), and 2.22, respectively. The product (O-3HBA) with reactive aldehyde and hydroxyl group was soluble in most polar organic solvents and was composed of phenylene units. Thermal properties of the oligomer were investigated by thermogravimetric analyses under an air atmosphere. The weight loss of O-3HBA was found to be 5 and 50% at 231 and > 1000 degrees C, respectively. The carboneous residue of the O-3HBA was 54% at 1000 degrees C. (c) 2006 Wiley Periodicals, Inc.
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    The synthesis, characterization and thermal stability of oligo-4-hydroxybenzaldehyde
    (ELSEVIER SCI LTD, 2004) Mart, H; Yuruk, H; Sacak, M; Muradoglu, V; Vilayetoglu, AR
    Oligo-4-hydroxybenzaldehyde (OHBA) was synthesized from the oxidative polycondensation of 4-hydroxybenzaldehyde (HBA) with hydrogenperoxide (H2O2) in an aqueous alkaline medium at 85 degreesC. The product was characterized by H-1 NMR, FT-IR, UV-Vis and elemental analysis. The number average molecular weight, mass average molecular weight and polydispersity index values of OHBA were found to be 5171, 8625 g mol(-1) and 1.668, respectively. The thermal stability of the oligomer was measured by thermogravimetric analyses (TG) under an air atmosphere. TG analyses showed OHBA to be resistant to thermo-oxidative decomposition. The weight loss of OHBA was found to be 5, 50 and 89% at 171, 845 and 900 degreesC, respectively. According to TG analyses, the carboneous residues of the OHBA was 49.29% at 900 degreesC. (C) 2003 Elsevier Ltd. All rights reserved.